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Finding the Fourth Proportional to 85,971,852.80, 128,957,779.20 and 66,488,307.20

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Solution

The fourth proportional to 85,971,852.80, 128,957,779.20 and 66,488,307.20 is: 99,732,460.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,971,852.80 : 128,957,779.20 = 66,488,307.20 : x
  2. Step 2: Convert to fraction form
    85,971,852.80/128,957,779.20 = 66,488,307.20/x
  3. Step 3: Cross multiply
    85,971,852.80x = 128,957,779.20 × 66,488,307.20
  4. Step 4: Simplify right side
    85,971,852.80x = 8,574,184,439,279,371
  5. Step 5: Solve for x
    x = 8,574,184,439,279,371/85,971,852.80
  6. Step 6: Final answer
    x = 99,732,460.80

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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.