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Finding the Fourth Proportional to 1,042.90, 1,564.41 and 393.46

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Solution

The fourth proportional to 1,042.90, 1,564.41 and 393.46 is: 590.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.90 : 1,564.41 = 393.46 : x
  2. Step 2: Convert to fraction form
    1,042.90/1,564.41 = 393.46/x
  3. Step 3: Cross multiply
    1,042.90x = 1,564.41 × 393.46
  4. Step 4: Simplify right side
    1,042.90x = 615,532.76
  5. Step 5: Solve for x
    x = 615,532.76/1,042.90
  6. Step 6: Final answer
    x = 590.21

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Double scale
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1.5x scale

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.