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Finding the Fourth Proportional to 128,015.40, 176,659.74 and 70,655.16

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Solution

The fourth proportional to 128,015.40, 176,659.74 and 70,655.16 is: 97,503.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,015.40 : 176,659.74 = 70,655.16 : x
  2. Step 2: Convert to fraction form
    128,015.40/176,659.74 = 70,655.16/x
  3. Step 3: Cross multiply
    128,015.40x = 176,659.74 × 70,655.16
  4. Step 4: Simplify right side
    128,015.40x = 12,481,922,195.26
  5. Step 5: Solve for x
    x = 12,481,922,195.26/128,015.40
  6. Step 6: Final answer
    x = 97,503.29

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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.