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Finding the Fourth Proportional to 390,859,222.60, 586,867,368.30 and 218,679,920.20

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Solution

The fourth proportional to 390,859,222.60, 586,867,368.30 and 218,679,920.20 is: 328,343,561.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,859,222.60 : 586,867,368.30 = 218,679,920.20 : x
  2. Step 2: Convert to fraction form
    390,859,222.60/586,867,368.30 = 218,679,920.20/x
  3. Step 3: Cross multiply
    390,859,222.60x = 586,867,368.30 × 218,679,920.20
  4. Step 4: Simplify right side
    390,859,222.60x = 128,336,109,267,828,000
  5. Step 5: Solve for x
    x = 128,336,109,267,828,000/390,859,222.60
  6. Step 6: Final answer
    x = 328,343,561.69

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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.