Home / 138,607.02-191,276.76-78,178.16

Finding the Fourth Proportional to 138,607.02, 191,276.76 and 78,178.16

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Solution

The fourth proportional to 138,607.02, 191,276.76 and 78,178.16 is: 107,885.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,607.02 : 191,276.76 = 78,178.16 : x
  2. Step 2: Convert to fraction form
    138,607.02/191,276.76 = 78,178.16/x
  3. Step 3: Cross multiply
    138,607.02x = 191,276.76 × 78,178.16
  4. Step 4: Simplify right side
    138,607.02x = 14,953,665,625.75
  5. Step 5: Solve for x
    x = 14,953,665,625.75/138,607.02
  6. Step 6: Final answer
    x = 107,885.34

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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.