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Finding the Fourth Proportional to 714,240.90, 985,664.54 and 391,980.98

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Solution

The fourth proportional to 714,240.90, 985,664.54 and 391,980.98 is: 540,940.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    714,240.90 : 985,664.54 = 391,980.98 : x
  2. Step 2: Convert to fraction form
    714,240.90/985,664.54 = 391,980.98/x
  3. Step 3: Cross multiply
    714,240.90x = 985,664.54 × 391,980.98
  4. Step 4: Simplify right side
    714,240.90x = 386,361,752,340.45
  5. Step 5: Solve for x
    x = 386,361,752,340.45/714,240.90
  6. Step 6: Final answer
    x = 540,940.39

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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.