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Finding the Fourth Proportional to 21,071.70, 31,607.21 and 6,280.70

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Solution

The fourth proportional to 21,071.70, 31,607.21 and 6,280.70 is: 9,420.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,071.70 : 31,607.21 = 6,280.70 : x
  2. Step 2: Convert to fraction form
    21,071.70/31,607.21 = 6,280.70/x
  3. Step 3: Cross multiply
    21,071.70x = 31,607.21 × 6,280.70
  4. Step 4: Simplify right side
    21,071.70x = 198,515,261.51
  5. Step 5: Solve for x
    x = 198,515,261.51/21,071.70
  6. Step 6: Final answer
    x = 9,420.94

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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.