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Finding the Fourth Proportional to 129,653, 178,916.66 and 73,061

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Solution

The fourth proportional to 129,653, 178,916.66 and 73,061 is: 100,821.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,653 : 178,916.66 = 73,061 : x
  2. Step 2: Convert to fraction form
    129,653/178,916.66 = 73,061/x
  3. Step 3: Cross multiply
    129,653x = 178,916.66 × 73,061
  4. Step 4: Simplify right side
    129,653x = 13,071,830,096.26
  5. Step 5: Solve for x
    x = 13,071,830,096.26/129,653
  6. Step 6: Final answer
    x = 100,821.66

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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.