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Finding the Fourth Proportional to 877.34, 1,315.81 and 390.13

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Solution

The fourth proportional to 877.34, 1,315.81 and 390.13 is: 585.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.34 : 1,315.81 = 390.13 : x
  2. Step 2: Convert to fraction form
    877.34/1,315.81 = 390.13/x
  3. Step 3: Cross multiply
    877.34x = 1,315.81 × 390.13
  4. Step 4: Simplify right side
    877.34x = 513,328.43
  5. Step 5: Solve for x
    x = 513,328.43/877.34
  6. Step 6: Final answer
    x = 585.10

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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.