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Finding the Fourth Proportional to 700.90, 1,051.71 and 290.20

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Solution

The fourth proportional to 700.90, 1,051.71 and 290.20 is: 435.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.90 : 1,051.71 = 290.20 : x
  2. Step 2: Convert to fraction form
    700.90/1,051.71 = 290.20/x
  3. Step 3: Cross multiply
    700.90x = 1,051.71 × 290.20
  4. Step 4: Simplify right side
    700.90x = 305,206.24
  5. Step 5: Solve for x
    x = 305,206.24/700.90
  6. Step 6: Final answer
    x = 435.45

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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.