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Finding the Fourth Proportional to 875.24, 1,207.38 and 717.86

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Solution

The fourth proportional to 875.24, 1,207.38 and 717.86 is: 990.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.24 : 1,207.38 = 717.86 : x
  2. Step 2: Convert to fraction form
    875.24/1,207.38 = 717.86/x
  3. Step 3: Cross multiply
    875.24x = 1,207.38 × 717.86
  4. Step 4: Simplify right side
    875.24x = 866,729.81
  5. Step 5: Solve for x
    x = 866,729.81/875.24
  6. Step 6: Final answer
    x = 990.28

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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.