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Finding the Fourth Proportional to 387,407.40, 581,111.10 and 137,999.40

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Solution

The fourth proportional to 387,407.40, 581,111.10 and 137,999.40 is: 206,999.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,407.40 : 581,111.10 = 137,999.40 : x
  2. Step 2: Convert to fraction form
    387,407.40/581,111.10 = 137,999.40/x
  3. Step 3: Cross multiply
    387,407.40x = 581,111.10 × 137,999.40
  4. Step 4: Simplify right side
    387,407.40x = 80,192,983,133.34
  5. Step 5: Solve for x
    x = 80,192,983,133.34/387,407.40
  6. Step 6: Final answer
    x = 206,999.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.