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Finding the Fourth Proportional to 72,289.99, 99,690.20 and 56,368.63

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Solution

The fourth proportional to 72,289.99, 99,690.20 and 56,368.63 is: 77,734.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,289.99 : 99,690.20 = 56,368.63 : x
  2. Step 2: Convert to fraction form
    72,289.99/99,690.20 = 56,368.63/x
  3. Step 3: Cross multiply
    72,289.99x = 99,690.20 × 56,368.63
  4. Step 4: Simplify right side
    72,289.99x = 5,619,399,608.28
  5. Step 5: Solve for x
    x = 5,619,399,608.28/72,289.99
  6. Step 6: Final answer
    x = 77,734.13

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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.