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Finding the Fourth Proportional to 877.89, 1,316.88 and 390.81

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Solution

The fourth proportional to 877.89, 1,316.88 and 390.81 is: 586.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.89 : 1,316.88 = 390.81 : x
  2. Step 2: Convert to fraction form
    877.89/1,316.88 = 390.81/x
  3. Step 3: Cross multiply
    877.89x = 1,316.88 × 390.81
  4. Step 4: Simplify right side
    877.89x = 514,649.87
  5. Step 5: Solve for x
    x = 514,649.87/877.89
  6. Step 6: Final answer
    x = 586.24

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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.