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Finding the Fourth Proportional to 1,038.87, 1,557.90 and 714.33

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Solution

The fourth proportional to 1,038.87, 1,557.90 and 714.33 is: 1,071.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.87 : 1,557.90 = 714.33 : x
  2. Step 2: Convert to fraction form
    1,038.87/1,557.90 = 714.33/x
  3. Step 3: Cross multiply
    1,038.87x = 1,557.90 × 714.33
  4. Step 4: Simplify right side
    1,038.87x = 1,112,854.71
  5. Step 5: Solve for x
    x = 1,112,854.71/1,038.87
  6. Step 6: Final answer
    x = 1,071.22

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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.