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Finding the Fourth Proportional to 1,070.90, 1,477.76 and 698.60

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Solution

The fourth proportional to 1,070.90, 1,477.76 and 698.60 is: 964.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,070.90 : 1,477.76 = 698.60 : x
  2. Step 2: Convert to fraction form
    1,070.90/1,477.76 = 698.60/x
  3. Step 3: Cross multiply
    1,070.90x = 1,477.76 × 698.60
  4. Step 4: Simplify right side
    1,070.90x = 1,032,352.25
  5. Step 5: Solve for x
    x = 1,032,352.25/1,070.90
  6. Step 6: Final answer
    x = 964.01

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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.