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Finding the Fourth Proportional to 817.69, 1,127.56 and 631.21

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Solution

The fourth proportional to 817.69, 1,127.56 and 631.21 is: 870.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.69 : 1,127.56 = 631.21 : x
  2. Step 2: Convert to fraction form
    817.69/1,127.56 = 631.21/x
  3. Step 3: Cross multiply
    817.69x = 1,127.56 × 631.21
  4. Step 4: Simplify right side
    817.69x = 711,727.15
  5. Step 5: Solve for x
    x = 711,727.15/817.69
  6. Step 6: Final answer
    x = 870.41

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.