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Finding the Fourth Proportional to 840.04, 1,159.21 and 485.90

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Solution

The fourth proportional to 840.04, 1,159.21 and 485.90 is: 670.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.04 : 1,159.21 = 485.90 : x
  2. Step 2: Convert to fraction form
    840.04/1,159.21 = 485.90/x
  3. Step 3: Cross multiply
    840.04x = 1,159.21 × 485.90
  4. Step 4: Simplify right side
    840.04x = 563,259.30
  5. Step 5: Solve for x
    x = 563,259.30/840.04
  6. Step 6: Final answer
    x = 670.52

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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.