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Finding the Fourth Proportional to 1,090.09, 1,503.81 and 647.74

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Solution

The fourth proportional to 1,090.09, 1,503.81 and 647.74 is: 893.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.09 : 1,503.81 = 647.74 : x
  2. Step 2: Convert to fraction form
    1,090.09/1,503.81 = 647.74/x
  3. Step 3: Cross multiply
    1,090.09x = 1,503.81 × 647.74
  4. Step 4: Simplify right side
    1,090.09x = 974,077.89
  5. Step 5: Solve for x
    x = 974,077.89/1,090.09
  6. Step 6: Final answer
    x = 893.58

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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.