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Finding the Fourth Proportional to 1,058.70, 1,586.70 and 509.70

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Solution

The fourth proportional to 1,058.70, 1,586.70 and 509.70 is: 763.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,058.70 : 1,586.70 = 509.70 : x
  2. Step 2: Convert to fraction form
    1,058.70/1,586.70 = 509.70/x
  3. Step 3: Cross multiply
    1,058.70x = 1,586.70 × 509.70
  4. Step 4: Simplify right side
    1,058.70x = 808,740.99
  5. Step 5: Solve for x
    x = 808,740.99/1,058.70
  6. Step 6: Final answer
    x = 763.90

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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.