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Finding the Fourth Proportional to 139,173.06, 192,038.40 and 77,916.08

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Solution

The fourth proportional to 139,173.06, 192,038.40 and 77,916.08 is: 107,512.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,173.06 : 192,038.40 = 77,916.08 : x
  2. Step 2: Convert to fraction form
    139,173.06/192,038.40 = 77,916.08/x
  3. Step 3: Cross multiply
    139,173.06x = 192,038.40 × 77,916.08
  4. Step 4: Simplify right side
    139,173.06x = 14,962,879,337.47
  5. Step 5: Solve for x
    x = 14,962,879,337.47/139,173.06
  6. Step 6: Final answer
    x = 107,512.76

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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.