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Finding the Fourth Proportional to 1,038.51, 1,555.56 and 648.68

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Solution

The fourth proportional to 1,038.51, 1,555.56 and 648.68 is: 971.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.51 : 1,555.56 = 648.68 : x
  2. Step 2: Convert to fraction form
    1,038.51/1,555.56 = 648.68/x
  3. Step 3: Cross multiply
    1,038.51x = 1,555.56 × 648.68
  4. Step 4: Simplify right side
    1,038.51x = 1,009,052.88
  5. Step 5: Solve for x
    x = 1,009,052.88/1,038.51
  6. Step 6: Final answer
    x = 971.64

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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.