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Finding the Fourth Proportional to 875.49, 1,312.29 and 387.87

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Solution

The fourth proportional to 875.49, 1,312.29 and 387.87 is: 581.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.49 : 1,312.29 = 387.87 : x
  2. Step 2: Convert to fraction form
    875.49/1,312.29 = 387.87/x
  3. Step 3: Cross multiply
    875.49x = 1,312.29 × 387.87
  4. Step 4: Simplify right side
    875.49x = 508,997.92
  5. Step 5: Solve for x
    x = 508,997.92/875.49
  6. Step 6: Final answer
    x = 581.39

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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.