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Finding the Fourth Proportional to 1,070.84, 1,606.53 and 421.63

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Solution

The fourth proportional to 1,070.84, 1,606.53 and 421.63 is: 632.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.84 : 1,606.53 = 421.63 : x
  2. Step 2: Convert to fraction form
    1,070.84/1,606.53 = 421.63/x
  3. Step 3: Cross multiply
    1,070.84x = 1,606.53 × 421.63
  4. Step 4: Simplify right side
    1,070.84x = 677,358.81
  5. Step 5: Solve for x
    x = 677,358.81/1,070.84
  6. Step 6: Final answer
    x = 632.55

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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.