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Finding the Fourth Proportional to 1,242.92, 1,715.10 and 718.85

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Solution

The fourth proportional to 1,242.92, 1,715.10 and 718.85 is: 991.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,242.92 : 1,715.10 = 718.85 : x
  2. Step 2: Convert to fraction form
    1,242.92/1,715.10 = 718.85/x
  3. Step 3: Cross multiply
    1,242.92x = 1,715.10 × 718.85
  4. Step 4: Simplify right side
    1,242.92x = 1,232,899.64
  5. Step 5: Solve for x
    x = 1,232,899.64/1,242.92
  6. Step 6: Final answer
    x = 991.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.