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Finding the Fourth Proportional to 9,000.51, 12,420.45 and 5,223.45

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Solution

The fourth proportional to 9,000.51, 12,420.45 and 5,223.45 is: 7,208.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,000.51 : 12,420.45 = 5,223.45 : x
  2. Step 2: Convert to fraction form
    9,000.51/12,420.45 = 5,223.45/x
  3. Step 3: Cross multiply
    9,000.51x = 12,420.45 × 5,223.45
  4. Step 4: Simplify right side
    9,000.51x = 64,877,599.55
  5. Step 5: Solve for x
    x = 64,877,599.55/9,000.51
  6. Step 6: Final answer
    x = 7,208.21

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.