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Finding the Fourth Proportional to 501.28, 691.80 and 304.76

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Solution

The fourth proportional to 501.28, 691.80 and 304.76 is: 420.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.28 : 691.80 = 304.76 : x
  2. Step 2: Convert to fraction form
    501.28/691.80 = 304.76/x
  3. Step 3: Cross multiply
    501.28x = 691.80 × 304.76
  4. Step 4: Simplify right side
    501.28x = 210,832.97
  5. Step 5: Solve for x
    x = 210,832.97/501.28
  6. Step 6: Final answer
    x = 420.59

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Find fourth proportional to 250.64, 345.90 and 152.38
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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.