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Finding the Fourth Proportional to 390,849,793.60, 586,274,690.40 and 199,348,686.40

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Solution

The fourth proportional to 390,849,793.60, 586,274,690.40 and 199,348,686.40 is: 299,023,029.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,849,793.60 : 586,274,690.40 = 199,348,686.40 : x
  2. Step 2: Convert to fraction form
    390,849,793.60/586,274,690.40 = 199,348,686.40/x
  3. Step 3: Cross multiply
    390,849,793.60x = 586,274,690.40 × 199,348,686.40
  4. Step 4: Simplify right side
    390,849,793.60x = 116,873,089,400,806,688
  5. Step 5: Solve for x
    x = 116,873,089,400,806,688/390,849,793.60
  6. Step 6: Final answer
    x = 299,023,029.60

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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.