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Finding the Fourth Proportional to 687,479.88, 948,707.94 and 381,538.47

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Solution

The fourth proportional to 687,479.88, 948,707.94 and 381,538.47 is: 526,515.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,479.88 : 948,707.94 = 381,538.47 : x
  2. Step 2: Convert to fraction form
    687,479.88/948,707.94 = 381,538.47/x
  3. Step 3: Cross multiply
    687,479.88x = 948,707.94 × 381,538.47
  4. Step 4: Simplify right side
    687,479.88x = 361,968,575,904.45
  5. Step 5: Solve for x
    x = 361,968,575,904.45/687,479.88
  6. Step 6: Final answer
    x = 526,515.16

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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.