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Finding the Fourth Proportional to 501.38, 691.90 and 304.85

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Solution

The fourth proportional to 501.38, 691.90 and 304.85 is: 420.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.38 : 691.90 = 304.85 : x
  2. Step 2: Convert to fraction form
    501.38/691.90 = 304.85/x
  3. Step 3: Cross multiply
    501.38x = 691.90 × 304.85
  4. Step 4: Simplify right side
    501.38x = 210,924.09
  5. Step 5: Solve for x
    x = 210,924.09/501.38
  6. Step 6: Final answer
    x = 420.69

Related Problems

Find fourth proportional to 250.69, 345.95 and 152.42
Half scale
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Double scale
Find fourth proportional to 502.38, 693.28 and 305.85
Similar ratio
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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.