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Finding the Fourth Proportional to 614.69, 847.91 and 378.76

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Solution

The fourth proportional to 614.69, 847.91 and 378.76 is: 522.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.69 : 847.91 = 378.76 : x
  2. Step 2: Convert to fraction form
    614.69/847.91 = 378.76/x
  3. Step 3: Cross multiply
    614.69x = 847.91 × 378.76
  4. Step 4: Simplify right side
    614.69x = 321,154.39
  5. Step 5: Solve for x
    x = 321,154.39/614.69
  6. Step 6: Final answer
    x = 522.47

Related Problems

Find fourth proportional to 307.35, 423.96 and 189.38
Half scale
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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.