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Finding the Fourth Proportional to 432,070.20, 648,105.30 and 390,079.80

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Solution

The fourth proportional to 432,070.20, 648,105.30 and 390,079.80 is: 585,119.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    432,070.20 : 648,105.30 = 390,079.80 : x
  2. Step 2: Convert to fraction form
    432,070.20/648,105.30 = 390,079.80/x
  3. Step 3: Cross multiply
    432,070.20x = 648,105.30 × 390,079.80
  4. Step 4: Simplify right side
    432,070.20x = 252,812,785,802.94
  5. Step 5: Solve for x
    x = 252,812,785,802.94/432,070.20
  6. Step 6: Final answer
    x = 585,119.70

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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.