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Finding the Fourth Proportional to 788.64, 1,088.40 and 457.20

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Solution

The fourth proportional to 788.64, 1,088.40 and 457.20 is: 630.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.64 : 1,088.40 = 457.20 : x
  2. Step 2: Convert to fraction form
    788.64/1,088.40 = 457.20/x
  3. Step 3: Cross multiply
    788.64x = 1,088.40 × 457.20
  4. Step 4: Simplify right side
    788.64x = 497,616.48
  5. Step 5: Solve for x
    x = 497,616.48/788.64
  6. Step 6: Final answer
    x = 630.98

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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.