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Finding the Fourth Proportional to 30,643.98, 42,293.61 and 28,642.87

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Solution

The fourth proportional to 30,643.98, 42,293.61 and 28,642.87 is: 39,531.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,643.98 : 42,293.61 = 28,642.87 : x
  2. Step 2: Convert to fraction form
    30,643.98/42,293.61 = 28,642.87/x
  3. Step 3: Cross multiply
    30,643.98x = 42,293.61 × 28,642.87
  4. Step 4: Simplify right side
    30,643.98x = 1,211,410,373.06
  5. Step 5: Solve for x
    x = 1,211,410,373.06/30,643.98
  6. Step 6: Final answer
    x = 39,531.76

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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.