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Finding the Fourth Proportional to 810.18, 1,118.10 and 478.86

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Solution

The fourth proportional to 810.18, 1,118.10 and 478.86 is: 660.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.18 : 1,118.10 = 478.86 : x
  2. Step 2: Convert to fraction form
    810.18/1,118.10 = 478.86/x
  3. Step 3: Cross multiply
    810.18x = 1,118.10 × 478.86
  4. Step 4: Simplify right side
    810.18x = 535,417.26
  5. Step 5: Solve for x
    x = 535,417.26/810.18
  6. Step 6: Final answer
    x = 660.86

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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.