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Finding the Fourth Proportional to 78,925, 108,916.56 and 45,391

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Solution

The fourth proportional to 78,925, 108,916.56 and 45,391 is: 62,639.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,925 : 108,916.56 = 45,391 : x
  2. Step 2: Convert to fraction form
    78,925/108,916.56 = 45,391/x
  3. Step 3: Cross multiply
    78,925x = 108,916.56 × 45,391
  4. Step 4: Simplify right side
    78,925x = 4,943,831,574.96
  5. Step 5: Solve for x
    x = 4,943,831,574.96/78,925
  6. Step 6: Final answer
    x = 62,639.61

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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.