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Finding the Fourth Proportional to 903.69, 1,247.40 and 530.64

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Solution

The fourth proportional to 903.69, 1,247.40 and 530.64 is: 732.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.69 : 1,247.40 = 530.64 : x
  2. Step 2: Convert to fraction form
    903.69/1,247.40 = 530.64/x
  3. Step 3: Cross multiply
    903.69x = 1,247.40 × 530.64
  4. Step 4: Simplify right side
    903.69x = 661,920.34
  5. Step 5: Solve for x
    x = 661,920.34/903.69
  6. Step 6: Final answer
    x = 732.46

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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.