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Finding the Fourth Proportional to 877.14, 1,316.30 and 390.02

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Solution

The fourth proportional to 877.14, 1,316.30 and 390.02 is: 585.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.14 : 1,316.30 = 390.02 : x
  2. Step 2: Convert to fraction form
    877.14/1,316.30 = 390.02/x
  3. Step 3: Cross multiply
    877.14x = 1,316.30 × 390.02
  4. Step 4: Simplify right side
    877.14x = 513,374.79
  5. Step 5: Solve for x
    x = 513,374.79/877.14
  6. Step 6: Final answer
    x = 585.28

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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.