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Finding the Fourth Proportional to 1,615.75, 2,421.59 and 690.21

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Solution

The fourth proportional to 1,615.75, 2,421.59 and 690.21 is: 1,034.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,615.75 : 2,421.59 = 690.21 : x
  2. Step 2: Convert to fraction form
    1,615.75/2,421.59 = 690.21/x
  3. Step 3: Cross multiply
    1,615.75x = 2,421.59 × 690.21
  4. Step 4: Simplify right side
    1,615.75x = 1,671,402.18
  5. Step 5: Solve for x
    x = 1,671,402.18/1,615.75
  6. Step 6: Final answer
    x = 1,034.45

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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.