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Finding the Fourth Proportional to 128,670.40, 177,522.61 and 77,663.76

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Solution

The fourth proportional to 128,670.40, 177,522.61 and 77,663.76 is: 107,150.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,670.40 : 177,522.61 = 77,663.76 : x
  2. Step 2: Convert to fraction form
    128,670.40/177,522.61 = 77,663.76/x
  3. Step 3: Cross multiply
    128,670.40x = 177,522.61 × 77,663.76
  4. Step 4: Simplify right side
    128,670.40x = 13,787,073,880.36
  5. Step 5: Solve for x
    x = 13,787,073,880.36/128,670.40
  6. Step 6: Final answer
    x = 107,150.32

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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.