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Finding the Fourth Proportional to 1,138.66, 1,710.15 and 974.50

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Solution

The fourth proportional to 1,138.66, 1,710.15 and 974.50 is: 1,463.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.66 : 1,710.15 = 974.50 : x
  2. Step 2: Convert to fraction form
    1,138.66/1,710.15 = 974.50/x
  3. Step 3: Cross multiply
    1,138.66x = 1,710.15 × 974.50
  4. Step 4: Simplify right side
    1,138.66x = 1,666,541.18
  5. Step 5: Solve for x
    x = 1,666,541.18/1,138.66
  6. Step 6: Final answer
    x = 1,463.60

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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.