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Finding the Fourth Proportional to 10,365.90, 15,512.40 and 7,085.40

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Solution

The fourth proportional to 10,365.90, 15,512.40 and 7,085.40 is: 10,603.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,365.90 : 15,512.40 = 7,085.40 : x
  2. Step 2: Convert to fraction form
    10,365.90/15,512.40 = 7,085.40/x
  3. Step 3: Cross multiply
    10,365.90x = 15,512.40 × 7,085.40
  4. Step 4: Simplify right side
    10,365.90x = 109,911,558.96
  5. Step 5: Solve for x
    x = 109,911,558.96/10,365.90
  6. Step 6: Final answer
    x = 10,603.19

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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.