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Finding the Fourth Proportional to 830.72, 1,146.36 and 457.70

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Solution

The fourth proportional to 830.72, 1,146.36 and 457.70 is: 631.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.72 : 1,146.36 = 457.70 : x
  2. Step 2: Convert to fraction form
    830.72/1,146.36 = 457.70/x
  3. Step 3: Cross multiply
    830.72x = 1,146.36 × 457.70
  4. Step 4: Simplify right side
    830.72x = 524,688.97
  5. Step 5: Solve for x
    x = 524,688.97/830.72
  6. Step 6: Final answer
    x = 631.61

Related Problems

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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.