Home / 103,859.79-143,345.19-99,126.78

Finding the Fourth Proportional to 103,859.79, 143,345.19 and 99,126.78

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Solution

The fourth proportional to 103,859.79, 143,345.19 and 99,126.78 is: 136,812.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,859.79 : 143,345.19 = 99,126.78 : x
  2. Step 2: Convert to fraction form
    103,859.79/143,345.19 = 99,126.78/x
  3. Step 3: Cross multiply
    103,859.79x = 143,345.19 × 99,126.78
  4. Step 4: Simplify right side
    103,859.79x = 14,209,347,113.19
  5. Step 5: Solve for x
    x = 14,209,347,113.19/103,859.79
  6. Step 6: Final answer
    x = 136,812.78

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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.