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Finding the Fourth Proportional to 85,813,548.30, 128,720,322.45 and 85,813,548.30

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Solution

The fourth proportional to 85,813,548.30, 128,720,322.45 and 85,813,548.30 is: 128,720,322.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,813,548.30 : 128,720,322.45 = 85,813,548.30 : x
  2. Step 2: Convert to fraction form
    85,813,548.30/128,720,322.45 = 85,813,548.30/x
  3. Step 3: Cross multiply
    85,813,548.30x = 128,720,322.45 × 85,813,548.30
  4. Step 4: Simplify right side
    85,813,548.30x = 11,045,947,607,754,650
  5. Step 5: Solve for x
    x = 11,045,947,607,754,650/85,813,548.30
  6. Step 6: Final answer
    x = 128,720,322.45

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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.