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Finding the Fourth Proportional to 128,220.47, 176,934.98 and 70,859.10

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Solution

The fourth proportional to 128,220.47, 176,934.98 and 70,859.10 is: 97,780.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,220.47 : 176,934.98 = 70,859.10 : x
  2. Step 2: Convert to fraction form
    128,220.47/176,934.98 = 70,859.10/x
  3. Step 3: Cross multiply
    128,220.47x = 176,934.98 × 70,859.10
  4. Step 4: Simplify right side
    128,220.47x = 12,537,453,441.32
  5. Step 5: Solve for x
    x = 12,537,453,441.32/128,220.47
  6. Step 6: Final answer
    x = 97,780.44

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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.