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Finding the Fourth Proportional to 18,698,867.61, 28,059,231.29 and 13,506,356.89

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Solution

The fourth proportional to 18,698,867.61, 28,059,231.29 and 13,506,356.89 is: 20,267,430.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,698,867.61 : 28,059,231.29 = 13,506,356.89 : x
  2. Step 2: Convert to fraction form
    18,698,867.61/28,059,231.29 = 13,506,356.89/x
  3. Step 3: Cross multiply
    18,698,867.61x = 28,059,231.29 × 13,506,356.89
  4. Step 4: Simplify right side
    18,698,867.61x = 378,977,991,944,615.50
  5. Step 5: Solve for x
    x = 378,977,991,944,615.50/18,698,867.61
  6. Step 6: Final answer
    x = 20,267,430.08

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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.