Home / 811,542.80-1,217,314.20-390,717.20

Finding the Fourth Proportional to 811,542.80, 1,217,314.20 and 390,717.20

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Solution

The fourth proportional to 811,542.80, 1,217,314.20 and 390,717.20 is: 586,075.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,542.80 : 1,217,314.20 = 390,717.20 : x
  2. Step 2: Convert to fraction form
    811,542.80/1,217,314.20 = 390,717.20/x
  3. Step 3: Cross multiply
    811,542.80x = 1,217,314.20 × 390,717.20
  4. Step 4: Simplify right side
    811,542.80x = 475,625,595,744.24
  5. Step 5: Solve for x
    x = 475,625,595,744.24/811,542.80
  6. Step 6: Final answer
    x = 586,075.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.