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Finding the Fourth Proportional to 129,688.56, 178,970.16 and 70,072.56

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Solution

The fourth proportional to 129,688.56, 178,970.16 and 70,072.56 is: 96,700.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,688.56 : 178,970.16 = 70,072.56 : x
  2. Step 2: Convert to fraction form
    129,688.56/178,970.16 = 70,072.56/x
  3. Step 3: Cross multiply
    129,688.56x = 178,970.16 × 70,072.56
  4. Step 4: Simplify right side
    129,688.56x = 12,540,897,274.81
  5. Step 5: Solve for x
    x = 12,540,897,274.81/129,688.56
  6. Step 6: Final answer
    x = 96,700.10

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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.