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Finding the Fourth Proportional to 290,561,987.60, 435,842,981.40 and 128,832,246.80

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Solution

The fourth proportional to 290,561,987.60, 435,842,981.40 and 128,832,246.80 is: 193,248,370.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,561,987.60 : 435,842,981.40 = 128,832,246.80 : x
  2. Step 2: Convert to fraction form
    290,561,987.60/435,842,981.40 = 128,832,246.80/x
  3. Step 3: Cross multiply
    290,561,987.60x = 435,842,981.40 × 128,832,246.80
  4. Step 4: Simplify right side
    290,561,987.60x = 56,150,630,545,772,608
  5. Step 5: Solve for x
    x = 56,150,630,545,772,608/290,561,987.60
  6. Step 6: Final answer
    x = 193,248,370.20

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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.