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Finding the Fourth Proportional to 128,366.51, 177,152.00 and 71,005.58

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Solution

The fourth proportional to 128,366.51, 177,152.00 and 71,005.58 is: 97,991.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,366.51 : 177,152.00 = 71,005.58 : x
  2. Step 2: Convert to fraction form
    128,366.51/177,152.00 = 71,005.58/x
  3. Step 3: Cross multiply
    128,366.51x = 177,152.00 × 71,005.58
  4. Step 4: Simplify right side
    128,366.51x = 12,578,779,931.69
  5. Step 5: Solve for x
    x = 12,578,779,931.69/128,366.51
  6. Step 6: Final answer
    x = 97,991.14

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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.