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Finding the Fourth Proportional to 1,085.58, 1,498.68 and 643.68

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Solution

The fourth proportional to 1,085.58, 1,498.68 and 643.68 is: 888.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.58 : 1,498.68 = 643.68 : x
  2. Step 2: Convert to fraction form
    1,085.58/1,498.68 = 643.68/x
  3. Step 3: Cross multiply
    1,085.58x = 1,498.68 × 643.68
  4. Step 4: Simplify right side
    1,085.58x = 964,670.34
  5. Step 5: Solve for x
    x = 964,670.34/1,085.58
  6. Step 6: Final answer
    x = 888.62

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1.5x scale

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.