Home / 138,570.04-191,223.99-78,139.59

Finding the Fourth Proportional to 138,570.04, 191,223.99 and 78,139.59

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Solution

The fourth proportional to 138,570.04, 191,223.99 and 78,139.59 is: 107,831.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,570.04 : 191,223.99 = 78,139.59 : x
  2. Step 2: Convert to fraction form
    138,570.04/191,223.99 = 78,139.59/x
  3. Step 3: Cross multiply
    138,570.04x = 191,223.99 × 78,139.59
  4. Step 4: Simplify right side
    138,570.04x = 14,942,163,459.67
  5. Step 5: Solve for x
    x = 14,942,163,459.67/138,570.04
  6. Step 6: Final answer
    x = 107,831.13

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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.