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Finding the Fourth Proportional to 890.47, 1,228.85 and 517.67

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Solution

The fourth proportional to 890.47, 1,228.85 and 517.67 is: 714.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.47 : 1,228.85 = 517.67 : x
  2. Step 2: Convert to fraction form
    890.47/1,228.85 = 517.67/x
  3. Step 3: Cross multiply
    890.47x = 1,228.85 × 517.67
  4. Step 4: Simplify right side
    890.47x = 636,133.93
  5. Step 5: Solve for x
    x = 636,133.93/890.47
  6. Step 6: Final answer
    x = 714.38

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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.