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Finding the Fourth Proportional to 85,908.42, 128,881.17 and 25,931.93

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Solution

The fourth proportional to 85,908.42, 128,881.17 and 25,931.93 is: 38,903.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,908.42 : 128,881.17 = 25,931.93 : x
  2. Step 2: Convert to fraction form
    85,908.42/128,881.17 = 25,931.93/x
  3. Step 3: Cross multiply
    85,908.42x = 128,881.17 × 25,931.93
  4. Step 4: Simplify right side
    85,908.42x = 3,342,136,834.35
  5. Step 5: Solve for x
    x = 3,342,136,834.35/85,908.42
  6. Step 6: Final answer
    x = 38,903.48

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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.