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Finding the Fourth Proportional to 1,312.86, 1,968.76 and 435.32

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Solution

The fourth proportional to 1,312.86, 1,968.76 and 435.32 is: 652.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.86 : 1,968.76 = 435.32 : x
  2. Step 2: Convert to fraction form
    1,312.86/1,968.76 = 435.32/x
  3. Step 3: Cross multiply
    1,312.86x = 1,968.76 × 435.32
  4. Step 4: Simplify right side
    1,312.86x = 857,040.60
  5. Step 5: Solve for x
    x = 857,040.60/1,312.86
  6. Step 6: Final answer
    x = 652.80

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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.