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Finding the Fourth Proportional to 582.40, 875.20 and 420.96

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Solution

The fourth proportional to 582.40, 875.20 and 420.96 is: 632.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    582.40 : 875.20 = 420.96 : x
  2. Step 2: Convert to fraction form
    582.40/875.20 = 420.96/x
  3. Step 3: Cross multiply
    582.40x = 875.20 × 420.96
  4. Step 4: Simplify right side
    582.40x = 368,424.19
  5. Step 5: Solve for x
    x = 368,424.19/582.40
  6. Step 6: Final answer
    x = 632.60

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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.