Home / 21,215.40-31,823.10-5,420.40

Finding the Fourth Proportional to 21,215.40, 31,823.10 and 5,420.40

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Solution

The fourth proportional to 21,215.40, 31,823.10 and 5,420.40 is: 8,130.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.40 : 31,823.10 = 5,420.40 : x
  2. Step 2: Convert to fraction form
    21,215.40/31,823.10 = 5,420.40/x
  3. Step 3: Cross multiply
    21,215.40x = 31,823.10 × 5,420.40
  4. Step 4: Simplify right side
    21,215.40x = 172,493,931.24
  5. Step 5: Solve for x
    x = 172,493,931.24/21,215.40
  6. Step 6: Final answer
    x = 8,130.60

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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.