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Finding the Fourth Proportional to 99,078.80, 136,725.72 and 70,831.76

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Solution

The fourth proportional to 99,078.80, 136,725.72 and 70,831.76 is: 97,745.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,078.80 : 136,725.72 = 70,831.76 : x
  2. Step 2: Convert to fraction form
    99,078.80/136,725.72 = 70,831.76/x
  3. Step 3: Cross multiply
    99,078.80x = 136,725.72 × 70,831.76
  4. Step 4: Simplify right side
    99,078.80x = 9,684,523,384.87
  5. Step 5: Solve for x
    x = 9,684,523,384.87/99,078.80
  6. Step 6: Final answer
    x = 97,745.67

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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.