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Finding the Fourth Proportional to 390,876.40, 586,237.80 and 128,220.40

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Solution

The fourth proportional to 390,876.40, 586,237.80 and 128,220.40 is: 192,305.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,876.40 : 586,237.80 = 128,220.40 : x
  2. Step 2: Convert to fraction form
    390,876.40/586,237.80 = 128,220.40/x
  3. Step 3: Cross multiply
    390,876.40x = 586,237.80 × 128,220.40
  4. Step 4: Simplify right side
    390,876.40x = 75,167,645,211.12
  5. Step 5: Solve for x
    x = 75,167,645,211.12/390,876.40
  6. Step 6: Final answer
    x = 192,305.41

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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.