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Finding the Fourth Proportional to 875.09, 1,312.02 and 387.87

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Solution

The fourth proportional to 875.09, 1,312.02 and 387.87 is: 581.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.09 : 1,312.02 = 387.87 : x
  2. Step 2: Convert to fraction form
    875.09/1,312.02 = 387.87/x
  3. Step 3: Cross multiply
    875.09x = 1,312.02 × 387.87
  4. Step 4: Simplify right side
    875.09x = 508,893.20
  5. Step 5: Solve for x
    x = 508,893.20/875.09
  6. Step 6: Final answer
    x = 581.53

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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.