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Finding the Fourth Proportional to 407.40, 562.08 and 260.20

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Solution

The fourth proportional to 407.40, 562.08 and 260.20 is: 358.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.40 : 562.08 = 260.20 : x
  2. Step 2: Convert to fraction form
    407.40/562.08 = 260.20/x
  3. Step 3: Cross multiply
    407.40x = 562.08 × 260.20
  4. Step 4: Simplify right side
    407.40x = 146,253.22
  5. Step 5: Solve for x
    x = 146,253.22/407.40
  6. Step 6: Final answer
    x = 358.99

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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.