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Finding the Fourth Proportional to 85,801.40, 128,726.40 and 26,643.05

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Solution

The fourth proportional to 85,801.40, 128,726.40 and 26,643.05 is: 39,972.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,801.40 : 128,726.40 = 26,643.05 : x
  2. Step 2: Convert to fraction form
    85,801.40/128,726.40 = 26,643.05/x
  3. Step 3: Cross multiply
    85,801.40x = 128,726.40 × 26,643.05
  4. Step 4: Simplify right side
    85,801.40x = 3,429,663,911.52
  5. Step 5: Solve for x
    x = 3,429,663,911.52/85,801.40
  6. Step 6: Final answer
    x = 39,972.12

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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.