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Finding the Fourth Proportional to 128,030.40, 192,045.60 and 72,043.20

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Solution

The fourth proportional to 128,030.40, 192,045.60 and 72,043.20 is: 108,064.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,030.40 : 192,045.60 = 72,043.20 : x
  2. Step 2: Convert to fraction form
    128,030.40/192,045.60 = 72,043.20/x
  3. Step 3: Cross multiply
    128,030.40x = 192,045.60 × 72,043.20
  4. Step 4: Simplify right side
    128,030.40x = 13,835,579,569.92
  5. Step 5: Solve for x
    x = 13,835,579,569.92/128,030.40
  6. Step 6: Final answer
    x = 108,064.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.