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Finding the Fourth Proportional to 21,056.88, 31,590.48 and 7,910

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Solution

The fourth proportional to 21,056.88, 31,590.48 and 7,910 is: 11,866.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,056.88 : 31,590.48 = 7,910 : x
  2. Step 2: Convert to fraction form
    21,056.88/31,590.48 = 7,910/x
  3. Step 3: Cross multiply
    21,056.88x = 31,590.48 × 7,910
  4. Step 4: Simplify right side
    21,056.88x = 249,880,696.80
  5. Step 5: Solve for x
    x = 249,880,696.80/21,056.88
  6. Step 6: Final answer
    x = 11,866.94

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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.