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Finding the Fourth Proportional to 700.45, 1,051.35 and 661.72

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Solution

The fourth proportional to 700.45, 1,051.35 and 661.72 is: 993.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.45 : 1,051.35 = 661.72 : x
  2. Step 2: Convert to fraction form
    700.45/1,051.35 = 661.72/x
  3. Step 3: Cross multiply
    700.45x = 1,051.35 × 661.72
  4. Step 4: Simplify right side
    700.45x = 695,701.77
  5. Step 5: Solve for x
    x = 695,701.77/700.45
  6. Step 6: Final answer
    x = 993.22

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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.