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Finding the Fourth Proportional to 1,145.40, 1,718.10 and 835.80

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Solution

The fourth proportional to 1,145.40, 1,718.10 and 835.80 is: 1,253.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.40 : 1,718.10 = 835.80 : x
  2. Step 2: Convert to fraction form
    1,145.40/1,718.10 = 835.80/x
  3. Step 3: Cross multiply
    1,145.40x = 1,718.10 × 835.80
  4. Step 4: Simplify right side
    1,145.40x = 1,435,987.98
  5. Step 5: Solve for x
    x = 1,435,987.98/1,145.40
  6. Step 6: Final answer
    x = 1,253.70

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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.