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Finding the Fourth Proportional to 561.80, 841.56 and 318.08

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Solution

The fourth proportional to 561.80, 841.56 and 318.08 is: 476.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.80 : 841.56 = 318.08 : x
  2. Step 2: Convert to fraction form
    561.80/841.56 = 318.08/x
  3. Step 3: Cross multiply
    561.80x = 841.56 × 318.08
  4. Step 4: Simplify right side
    561.80x = 267,683.40
  5. Step 5: Solve for x
    x = 267,683.40/561.80
  6. Step 6: Final answer
    x = 476.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.