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Finding the Fourth Proportional to 78,313.40, 117,210.90 and 60,687.80

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Solution

The fourth proportional to 78,313.40, 117,210.90 and 60,687.80 is: 90,830.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,313.40 : 117,210.90 = 60,687.80 : x
  2. Step 2: Convert to fraction form
    78,313.40/117,210.90 = 60,687.80/x
  3. Step 3: Cross multiply
    78,313.40x = 117,210.90 × 60,687.80
  4. Step 4: Simplify right side
    78,313.40x = 7,113,271,657.02
  5. Step 5: Solve for x
    x = 7,113,271,657.02/78,313.40
  6. Step 6: Final answer
    x = 90,830.84

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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.