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Finding the Fourth Proportional to 85,731.51, 128,603.43 and 29,570.80

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Solution

The fourth proportional to 85,731.51, 128,603.43 and 29,570.80 is: 44,358.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,731.51 : 128,603.43 = 29,570.80 : x
  2. Step 2: Convert to fraction form
    85,731.51/128,603.43 = 29,570.80/x
  3. Step 3: Cross multiply
    85,731.51x = 128,603.43 × 29,570.80
  4. Step 4: Simplify right side
    85,731.51x = 3,802,906,307.84
  5. Step 5: Solve for x
    x = 3,802,906,307.84/85,731.51
  6. Step 6: Final answer
    x = 44,358.33

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1.5x scale

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.