Home / 30,688.47-42,335.08-18,731.05

Finding the Fourth Proportional to 30,688.47, 42,335.08 and 18,731.05

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Solution

The fourth proportional to 30,688.47, 42,335.08 and 18,731.05 is: 25,839.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,688.47 : 42,335.08 = 18,731.05 : x
  2. Step 2: Convert to fraction form
    30,688.47/42,335.08 = 18,731.05/x
  3. Step 3: Cross multiply
    30,688.47x = 42,335.08 × 18,731.05
  4. Step 4: Simplify right side
    30,688.47x = 792,980,400.25
  5. Step 5: Solve for x
    x = 792,980,400.25/30,688.47
  6. Step 6: Final answer
    x = 25,839.69

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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.