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Finding the Fourth Proportional to 66,216,657.60, 99,328,096.80 and 20,779,934.40

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Solution

The fourth proportional to 66,216,657.60, 99,328,096.80 and 20,779,934.40 is: 31,170,877.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,216,657.60 : 99,328,096.80 = 20,779,934.40 : x
  2. Step 2: Convert to fraction form
    66,216,657.60/99,328,096.80 = 20,779,934.40/x
  3. Step 3: Cross multiply
    66,216,657.60x = 99,328,096.80 × 20,779,934.40
  4. Step 4: Simplify right side
    66,216,657.60x = 2,064,031,335,580,849.75
  5. Step 5: Solve for x
    x = 2,064,031,335,580,849.75/66,216,657.60
  6. Step 6: Final answer
    x = 31,170,877.70

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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.