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Finding the Fourth Proportional to 877.24, 1,315.90 and 390.29

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Solution

The fourth proportional to 877.24, 1,315.90 and 390.29 is: 585.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.24 : 1,315.90 = 390.29 : x
  2. Step 2: Convert to fraction form
    877.24/1,315.90 = 390.29/x
  3. Step 3: Cross multiply
    877.24x = 1,315.90 × 390.29
  4. Step 4: Simplify right side
    877.24x = 513,582.61
  5. Step 5: Solve for x
    x = 513,582.61/877.24
  6. Step 6: Final answer
    x = 585.46

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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.