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Finding the Fourth Proportional to 72,619.49, 100,309.49 and 55,830.16

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Solution

The fourth proportional to 72,619.49, 100,309.49 and 55,830.16 is: 77,118.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,619.49 : 100,309.49 = 55,830.16 : x
  2. Step 2: Convert to fraction form
    72,619.49/100,309.49 = 55,830.16/x
  3. Step 3: Cross multiply
    72,619.49x = 100,309.49 × 55,830.16
  4. Step 4: Simplify right side
    72,619.49x = 5,600,294,931.82
  5. Step 5: Solve for x
    x = 5,600,294,931.82/72,619.49
  6. Step 6: Final answer
    x = 77,118.35

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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.