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Finding the Fourth Proportional to 1,058.40, 1,588.04 and 647.54

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Solution

The fourth proportional to 1,058.40, 1,588.04 and 647.54 is: 971.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.40 : 1,588.04 = 647.54 : x
  2. Step 2: Convert to fraction form
    1,058.40/1,588.04 = 647.54/x
  3. Step 3: Cross multiply
    1,058.40x = 1,588.04 × 647.54
  4. Step 4: Simplify right side
    1,058.40x = 1,028,319.42
  5. Step 5: Solve for x
    x = 1,028,319.42/1,058.40
  6. Step 6: Final answer
    x = 971.58

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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.