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Finding the Fourth Proportional to 788.78, 1,088.10 and 457.13

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Solution

The fourth proportional to 788.78, 1,088.10 and 457.13 is: 630.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.78 : 1,088.10 = 457.13 : x
  2. Step 2: Convert to fraction form
    788.78/1,088.10 = 457.13/x
  3. Step 3: Cross multiply
    788.78x = 1,088.10 × 457.13
  4. Step 4: Simplify right side
    788.78x = 497,403.15
  5. Step 5: Solve for x
    x = 497,403.15/788.78
  6. Step 6: Final answer
    x = 630.60

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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.