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Finding the Fourth Proportional to 278,300.20, 390,407.60 and 278,300.20

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Solution

The fourth proportional to 278,300.20, 390,407.60 and 278,300.20 is: 390,407.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,300.20 : 390,407.60 = 278,300.20 : x
  2. Step 2: Convert to fraction form
    278,300.20/390,407.60 = 278,300.20/x
  3. Step 3: Cross multiply
    278,300.20x = 390,407.60 × 278,300.20
  4. Step 4: Simplify right side
    278,300.20x = 108,650,513,161.52
  5. Step 5: Solve for x
    x = 108,650,513,161.52/278,300.20
  6. Step 6: Final answer
    x = 390,407.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.