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Finding the Fourth Proportional to 4,985.97, 7,478.99 and 1,287.95

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Solution

The fourth proportional to 4,985.97, 7,478.99 and 1,287.95 is: 1,931.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,985.97 : 7,478.99 = 1,287.95 : x
  2. Step 2: Convert to fraction form
    4,985.97/7,478.99 = 1,287.95/x
  3. Step 3: Cross multiply
    4,985.97x = 7,478.99 × 1,287.95
  4. Step 4: Simplify right side
    4,985.97x = 9,632,565.17
  5. Step 5: Solve for x
    x = 9,632,565.17/4,985.97
  6. Step 6: Final answer
    x = 1,931.93

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.