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Finding the Fourth Proportional to 810.78, 1,117.98 and 500.28

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Solution

The fourth proportional to 810.78, 1,117.98 and 500.28 is: 689.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.78 : 1,117.98 = 500.28 : x
  2. Step 2: Convert to fraction form
    810.78/1,117.98 = 500.28/x
  3. Step 3: Cross multiply
    810.78x = 1,117.98 × 500.28
  4. Step 4: Simplify right side
    810.78x = 559,303.03
  5. Step 5: Solve for x
    x = 559,303.03/810.78
  6. Step 6: Final answer
    x = 689.83

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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.