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Finding the Fourth Proportional to 987.71, 1,482.71 and 577.14

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Solution

The fourth proportional to 987.71, 1,482.71 and 577.14 is: 866.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.71 : 1,482.71 = 577.14 : x
  2. Step 2: Convert to fraction form
    987.71/1,482.71 = 577.14/x
  3. Step 3: Cross multiply
    987.71x = 1,482.71 × 577.14
  4. Step 4: Simplify right side
    987.71x = 855,731.14
  5. Step 5: Solve for x
    x = 855,731.14/987.71
  6. Step 6: Final answer
    x = 866.38

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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.