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Finding the Fourth Proportional to 904.78, 1,248.51 and 718.72

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Solution

The fourth proportional to 904.78, 1,248.51 and 718.72 is: 991.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    904.78 : 1,248.51 = 718.72 : x
  2. Step 2: Convert to fraction form
    904.78/1,248.51 = 718.72/x
  3. Step 3: Cross multiply
    904.78x = 1,248.51 × 718.72
  4. Step 4: Simplify right side
    904.78x = 897,329.11
  5. Step 5: Solve for x
    x = 897,329.11/904.78
  6. Step 6: Final answer
    x = 991.76

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Double scale
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1.5x scale

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.