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Finding the Fourth Proportional to 390,655.40, 585,906.30 and 127,999.40

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Solution

The fourth proportional to 390,655.40, 585,906.30 and 127,999.40 is: 191,973.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,655.40 : 585,906.30 = 127,999.40 : x
  2. Step 2: Convert to fraction form
    390,655.40/585,906.30 = 127,999.40/x
  3. Step 3: Cross multiply
    390,655.40x = 585,906.30 × 127,999.40
  4. Step 4: Simplify right side
    390,655.40x = 74,995,654,856.22
  5. Step 5: Solve for x
    x = 74,995,654,856.22/390,655.40
  6. Step 6: Final answer
    x = 191,973.94

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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.