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Finding the Fourth Proportional to 139,070.94, 191,916.06 and 75,407.40

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Solution

The fourth proportional to 139,070.94, 191,916.06 and 75,407.40 is: 104,061.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,070.94 : 191,916.06 = 75,407.40 : x
  2. Step 2: Convert to fraction form
    139,070.94/191,916.06 = 75,407.40/x
  3. Step 3: Cross multiply
    139,070.94x = 191,916.06 × 75,407.40
  4. Step 4: Simplify right side
    139,070.94x = 14,471,891,102.84
  5. Step 5: Solve for x
    x = 14,471,891,102.84/139,070.94
  6. Step 6: Final answer
    x = 104,061.22

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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.