Home / 20,688.90-28,547.16-12,618.06

Finding the Fourth Proportional to 20,688.90, 28,547.16 and 12,618.06

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Solution

The fourth proportional to 20,688.90, 28,547.16 and 12,618.06 is: 17,410.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.90 : 28,547.16 = 12,618.06 : x
  2. Step 2: Convert to fraction form
    20,688.90/28,547.16 = 12,618.06/x
  3. Step 3: Cross multiply
    20,688.90x = 28,547.16 × 12,618.06
  4. Step 4: Simplify right side
    20,688.90x = 360,209,777.71
  5. Step 5: Solve for x
    x = 360,209,777.71/20,688.90
  6. Step 6: Final answer
    x = 17,410.77

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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.