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Finding the Fourth Proportional to 61,387.47, 84,726.81 and 39,903.84

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Solution

The fourth proportional to 61,387.47, 84,726.81 and 39,903.84 is: 55,075.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,387.47 : 84,726.81 = 39,903.84 : x
  2. Step 2: Convert to fraction form
    61,387.47/84,726.81 = 39,903.84/x
  3. Step 3: Cross multiply
    61,387.47x = 84,726.81 × 39,903.84
  4. Step 4: Simplify right side
    61,387.47x = 3,380,925,069.95
  5. Step 5: Solve for x
    x = 3,380,925,069.95/61,387.47
  6. Step 6: Final answer
    x = 55,075.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.