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Finding the Fourth Proportional to 687,218.92, 948,475.88 and 381,393.53

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Solution

The fourth proportional to 687,218.92, 948,475.88 and 381,393.53 is: 526,386.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,218.92 : 948,475.88 = 381,393.53 : x
  2. Step 2: Convert to fraction form
    687,218.92/948,475.88 = 381,393.53/x
  3. Step 3: Cross multiply
    687,218.92x = 948,475.88 × 381,393.53
  4. Step 4: Simplify right side
    687,218.92x = 361,742,562,330.72
  5. Step 5: Solve for x
    x = 361,742,562,330.72/687,218.92
  6. Step 6: Final answer
    x = 526,386.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.