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Finding the Fourth Proportional to 687,430.15, 948,438.97 and 397,004.47

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Solution

The fourth proportional to 687,430.15, 948,438.97 and 397,004.47 is: 547,742.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,430.15 : 948,438.97 = 397,004.47 : x
  2. Step 2: Convert to fraction form
    687,430.15/948,438.97 = 397,004.47/x
  3. Step 3: Cross multiply
    687,430.15x = 948,438.97 × 397,004.47
  4. Step 4: Simplify right side
    687,430.15x = 376,534,510,612.20
  5. Step 5: Solve for x
    x = 376,534,510,612.20/687,430.15
  6. Step 6: Final answer
    x = 547,742.21

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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.