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Finding the Fourth Proportional to 1,018.40, 1,531.65 and 913.10

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Solution

The fourth proportional to 1,018.40, 1,531.65 and 913.10 is: 1,373.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,018.40 : 1,531.65 = 913.10 : x
  2. Step 2: Convert to fraction form
    1,018.40/1,531.65 = 913.10/x
  3. Step 3: Cross multiply
    1,018.40x = 1,531.65 × 913.10
  4. Step 4: Simplify right side
    1,018.40x = 1,398,549.62
  5. Step 5: Solve for x
    x = 1,398,549.62/1,018.40
  6. Step 6: Final answer
    x = 1,373.28

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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.