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Finding the Fourth Proportional to 988.76, 1,364.70 and 569.18

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Solution

The fourth proportional to 988.76, 1,364.70 and 569.18 is: 785.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.76 : 1,364.70 = 569.18 : x
  2. Step 2: Convert to fraction form
    988.76/1,364.70 = 569.18/x
  3. Step 3: Cross multiply
    988.76x = 1,364.70 × 569.18
  4. Step 4: Simplify right side
    988.76x = 776,753.12
  5. Step 5: Solve for x
    x = 776,753.12/988.76
  6. Step 6: Final answer
    x = 785.59

Related Problems

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Double scale
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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.