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Finding the Fourth Proportional to 64,818.95, 89,422.29 and 39,315.56

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Solution

The fourth proportional to 64,818.95, 89,422.29 and 39,315.56 is: 54,238.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,818.95 : 89,422.29 = 39,315.56 : x
  2. Step 2: Convert to fraction form
    64,818.95/89,422.29 = 39,315.56/x
  3. Step 3: Cross multiply
    64,818.95x = 89,422.29 × 39,315.56
  4. Step 4: Simplify right side
    64,818.95x = 3,515,686,960.72
  5. Step 5: Solve for x
    x = 3,515,686,960.72/64,818.95
  6. Step 6: Final answer
    x = 54,238.57

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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.