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Finding the Fourth Proportional to 390,070.80, 585,300.60 and 221,720.40

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Solution

The fourth proportional to 390,070.80, 585,300.60 and 221,720.40 is: 332,691.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,070.80 : 585,300.60 = 221,720.40 : x
  2. Step 2: Convert to fraction form
    390,070.80/585,300.60 = 221,720.40/x
  3. Step 3: Cross multiply
    390,070.80x = 585,300.60 × 221,720.40
  4. Step 4: Simplify right side
    390,070.80x = 129,773,083,152.24
  5. Step 5: Solve for x
    x = 129,773,083,152.24/390,070.80
  6. Step 6: Final answer
    x = 332,691.10

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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.