Home / 128,900.47-177,883.86-72,313.06

Finding the Fourth Proportional to 128,900.47, 177,883.86 and 72,313.06

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Solution

The fourth proportional to 128,900.47, 177,883.86 and 72,313.06 is: 99,792.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,900.47 : 177,883.86 = 72,313.06 : x
  2. Step 2: Convert to fraction form
    128,900.47/177,883.86 = 72,313.06/x
  3. Step 3: Cross multiply
    128,900.47x = 177,883.86 × 72,313.06
  4. Step 4: Simplify right side
    128,900.47x = 12,863,326,421.99
  5. Step 5: Solve for x
    x = 12,863,326,421.99/128,900.47
  6. Step 6: Final answer
    x = 99,792.70

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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.