Home / 21,979.04-30,331.14-12,547.40

Finding the Fourth Proportional to 21,979.04, 30,331.14 and 12,547.40

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Solution

The fourth proportional to 21,979.04, 30,331.14 and 12,547.40 is: 17,315.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.04 : 30,331.14 = 12,547.40 : x
  2. Step 2: Convert to fraction form
    21,979.04/30,331.14 = 12,547.40/x
  3. Step 3: Cross multiply
    21,979.04x = 30,331.14 × 12,547.40
  4. Step 4: Simplify right side
    21,979.04x = 380,576,946.04
  5. Step 5: Solve for x
    x = 380,576,946.04/21,979.04
  6. Step 6: Final answer
    x = 17,315.45

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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.