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Finding the Fourth Proportional to 1,347.50, 2,021.25 and 435.50

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Solution

The fourth proportional to 1,347.50, 2,021.25 and 435.50 is: 653.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,347.50 : 2,021.25 = 435.50 : x
  2. Step 2: Convert to fraction form
    1,347.50/2,021.25 = 435.50/x
  3. Step 3: Cross multiply
    1,347.50x = 2,021.25 × 435.50
  4. Step 4: Simplify right side
    1,347.50x = 880,254.38
  5. Step 5: Solve for x
    x = 880,254.38/1,347.50
  6. Step 6: Final answer
    x = 653.25

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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.