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Finding the Fourth Proportional to 388,920.80, 583,381.20 and 326,712.80

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Solution

The fourth proportional to 388,920.80, 583,381.20 and 326,712.80 is: 490,069.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,920.80 : 583,381.20 = 326,712.80 : x
  2. Step 2: Convert to fraction form
    388,920.80/583,381.20 = 326,712.80/x
  3. Step 3: Cross multiply
    388,920.80x = 583,381.20 × 326,712.80
  4. Step 4: Simplify right side
    388,920.80x = 190,598,105,319.36
  5. Step 5: Solve for x
    x = 190,598,105,319.36/388,920.80
  6. Step 6: Final answer
    x = 490,069.20

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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.