Home / 138,436.55-191,038.47-78,006.10

Finding the Fourth Proportional to 138,436.55, 191,038.47 and 78,006.10

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Solution

The fourth proportional to 138,436.55, 191,038.47 and 78,006.10 is: 107,646.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,436.55 : 191,038.47 = 78,006.10 : x
  2. Step 2: Convert to fraction form
    138,436.55/191,038.47 = 78,006.10/x
  3. Step 3: Cross multiply
    138,436.55x = 191,038.47 × 78,006.10
  4. Step 4: Simplify right side
    138,436.55x = 14,902,165,994.67
  5. Step 5: Solve for x
    x = 14,902,165,994.67/138,436.55
  6. Step 6: Final answer
    x = 107,646.18

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1.5x scale

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.