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Finding the Fourth Proportional to 60,509.40, 90,772.20 and 21,078.60

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Solution

The fourth proportional to 60,509.40, 90,772.20 and 21,078.60 is: 31,620.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,509.40 : 90,772.20 = 21,078.60 : x
  2. Step 2: Convert to fraction form
    60,509.40/90,772.20 = 21,078.60/x
  3. Step 3: Cross multiply
    60,509.40x = 90,772.20 × 21,078.60
  4. Step 4: Simplify right side
    60,509.40x = 1,913,350,894.92
  5. Step 5: Solve for x
    x = 1,913,350,894.92/60,509.40
  6. Step 6: Final answer
    x = 31,620.72

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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.