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Finding the Fourth Proportional to 128,349.61, 177,051.36 and 74,628.69

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Solution

The fourth proportional to 128,349.61, 177,051.36 and 74,628.69 is: 102,946.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,349.61 : 177,051.36 = 74,628.69 : x
  2. Step 2: Convert to fraction form
    128,349.61/177,051.36 = 74,628.69/x
  3. Step 3: Cross multiply
    128,349.61x = 177,051.36 × 74,628.69
  4. Step 4: Simplify right side
    128,349.61x = 13,213,111,059.52
  5. Step 5: Solve for x
    x = 13,213,111,059.52/128,349.61
  6. Step 6: Final answer
    x = 102,946.25

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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.