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Finding the Fourth Proportional to 85,878,111.80, 128,817,167.70 and 68,871,999.80

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Solution

The fourth proportional to 85,878,111.80, 128,817,167.70 and 68,871,999.80 is: 103,307,999.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,878,111.80 : 128,817,167.70 = 68,871,999.80 : x
  2. Step 2: Convert to fraction form
    85,878,111.80/128,817,167.70 = 68,871,999.80/x
  3. Step 3: Cross multiply
    85,878,111.80x = 128,817,167.70 × 68,871,999.80
  4. Step 4: Simplify right side
    85,878,111.80x = 8,871,895,948,070,966
  5. Step 5: Solve for x
    x = 8,871,895,948,070,966/85,878,111.80
  6. Step 6: Final answer
    x = 103,307,999.70

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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.