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Finding the Fourth Proportional to 1,013.70, 1,390.18 and 971.62

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Solution

The fourth proportional to 1,013.70, 1,390.18 and 971.62 is: 1,332.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,013.70 : 1,390.18 = 971.62 : x
  2. Step 2: Convert to fraction form
    1,013.70/1,390.18 = 971.62/x
  3. Step 3: Cross multiply
    1,013.70x = 1,390.18 × 971.62
  4. Step 4: Simplify right side
    1,013.70x = 1,350,726.69
  5. Step 5: Solve for x
    x = 1,350,726.69/1,013.70
  6. Step 6: Final answer
    x = 1,332.47

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.