Home / 112,739.85-155,400.32-76,430.18

Finding the Fourth Proportional to 112,739.85, 155,400.32 and 76,430.18

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Solution

The fourth proportional to 112,739.85, 155,400.32 and 76,430.18 is: 105,351.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,739.85 : 155,400.32 = 76,430.18 : x
  2. Step 2: Convert to fraction form
    112,739.85/155,400.32 = 76,430.18/x
  3. Step 3: Cross multiply
    112,739.85x = 155,400.32 × 76,430.18
  4. Step 4: Simplify right side
    112,739.85x = 11,877,275,009.23
  5. Step 5: Solve for x
    x = 11,877,275,009.23/112,739.85
  6. Step 6: Final answer
    x = 105,351.17

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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.