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Finding the Fourth Proportional to 830.06, 1,145.33 and 515.40

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Solution

The fourth proportional to 830.06, 1,145.33 and 515.40 is: 711.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.06 : 1,145.33 = 515.40 : x
  2. Step 2: Convert to fraction form
    830.06/1,145.33 = 515.40/x
  3. Step 3: Cross multiply
    830.06x = 1,145.33 × 515.40
  4. Step 4: Simplify right side
    830.06x = 590,300.51
  5. Step 5: Solve for x
    x = 590,300.51/830.06
  6. Step 6: Final answer
    x = 711.16

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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.