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Finding the Fourth Proportional to 14,430.78, 21,615.78 and 7,389.39

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Solution

The fourth proportional to 14,430.78, 21,615.78 and 7,389.39 is: 11,068.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,430.78 : 21,615.78 = 7,389.39 : x
  2. Step 2: Convert to fraction form
    14,430.78/21,615.78 = 7,389.39/x
  3. Step 3: Cross multiply
    14,430.78x = 21,615.78 × 7,389.39
  4. Step 4: Simplify right side
    14,430.78x = 159,727,428.57
  5. Step 5: Solve for x
    x = 159,727,428.57/14,430.78
  6. Step 6: Final answer
    x = 11,068.53

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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.