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Finding the Fourth Proportional to 390,859,203.60, 586,867,339.80 and 218,679,901.20

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Solution

The fourth proportional to 390,859,203.60, 586,867,339.80 and 218,679,901.20 is: 328,343,533.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,859,203.60 : 586,867,339.80 = 218,679,901.20 : x
  2. Step 2: Convert to fraction form
    390,859,203.60/586,867,339.80 = 218,679,901.20/x
  3. Step 3: Cross multiply
    390,859,203.60x = 586,867,339.80 × 218,679,901.20
  4. Step 4: Simplify right side
    390,859,203.60x = 128,336,091,884,970,816
  5. Step 5: Solve for x
    x = 128,336,091,884,970,816/390,859,203.60
  6. Step 6: Final answer
    x = 328,343,533.18

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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.