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Finding the Fourth Proportional to 875.76, 1,208.70 and 526.40

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Solution

The fourth proportional to 875.76, 1,208.70 and 526.40 is: 726.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.76 : 1,208.70 = 526.40 : x
  2. Step 2: Convert to fraction form
    875.76/1,208.70 = 526.40/x
  3. Step 3: Cross multiply
    875.76x = 1,208.70 × 526.40
  4. Step 4: Simplify right side
    875.76x = 636,259.68
  5. Step 5: Solve for x
    x = 636,259.68/875.76
  6. Step 6: Final answer
    x = 726.52

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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.