Home / 19,985.81-29,982.36-9,995.78

Finding the Fourth Proportional to 19,985.81, 29,982.36 and 9,995.78

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Solution

The fourth proportional to 19,985.81, 29,982.36 and 9,995.78 is: 14,995.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,985.81 : 29,982.36 = 9,995.78 : x
  2. Step 2: Convert to fraction form
    19,985.81/29,982.36 = 9,995.78/x
  3. Step 3: Cross multiply
    19,985.81x = 29,982.36 × 9,995.78
  4. Step 4: Simplify right side
    19,985.81x = 299,696,924.53
  5. Step 5: Solve for x
    x = 299,696,924.53/19,985.81
  6. Step 6: Final answer
    x = 14,995.49

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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.