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Finding the Fourth Proportional to 487,992.70, 728,667.36 and 430,588.20

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Solution

The fourth proportional to 487,992.70, 728,667.36 and 430,588.20 is: 642,951.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,992.70 : 728,667.36 = 430,588.20 : x
  2. Step 2: Convert to fraction form
    487,992.70/728,667.36 = 430,588.20/x
  3. Step 3: Cross multiply
    487,992.70x = 728,667.36 × 430,588.20
  4. Step 4: Simplify right side
    487,992.70x = 313,755,566,941.15
  5. Step 5: Solve for x
    x = 313,755,566,941.15/487,992.70
  6. Step 6: Final answer
    x = 642,951.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.