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Finding the Fourth Proportional to 128,365.51, 177,130.78 and 70,995.72

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Solution

The fourth proportional to 128,365.51, 177,130.78 and 70,995.72 is: 97,966.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,365.51 : 177,130.78 = 70,995.72 : x
  2. Step 2: Convert to fraction form
    128,365.51/177,130.78 = 70,995.72/x
  3. Step 3: Cross multiply
    128,365.51x = 177,130.78 × 70,995.72
  4. Step 4: Simplify right side
    128,365.51x = 12,575,526,837.88
  5. Step 5: Solve for x
    x = 12,575,526,837.88/128,365.51
  6. Step 6: Final answer
    x = 97,966.55

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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.