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Finding the Fourth Proportional to 810.07, 1,117.60 and 731.50

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Solution

The fourth proportional to 810.07, 1,117.60 and 731.50 is: 1,009.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.07 : 1,117.60 = 731.50 : x
  2. Step 2: Convert to fraction form
    810.07/1,117.60 = 731.50/x
  3. Step 3: Cross multiply
    810.07x = 1,117.60 × 731.50
  4. Step 4: Simplify right side
    810.07x = 817,524.40
  5. Step 5: Solve for x
    x = 817,524.40/810.07
  6. Step 6: Final answer
    x = 1,009.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.