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Finding the Fourth Proportional to 79,920.90, 119,946.15 and 77,328.90

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Solution

The fourth proportional to 79,920.90, 119,946.15 and 77,328.90 is: 116,056.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,920.90 : 119,946.15 = 77,328.90 : x
  2. Step 2: Convert to fraction form
    79,920.90/119,946.15 = 77,328.90/x
  3. Step 3: Cross multiply
    79,920.90x = 119,946.15 × 77,328.90
  4. Step 4: Simplify right side
    79,920.90x = 9,275,303,838.74
  5. Step 5: Solve for x
    x = 9,275,303,838.74/79,920.90
  6. Step 6: Final answer
    x = 116,056.05

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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.