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Finding the Fourth Proportional to 840.30, 1,159.76 and 486.16

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Solution

The fourth proportional to 840.30, 1,159.76 and 486.16 is: 670.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.30 : 1,159.76 = 486.16 : x
  2. Step 2: Convert to fraction form
    840.30/1,159.76 = 486.16/x
  3. Step 3: Cross multiply
    840.30x = 1,159.76 × 486.16
  4. Step 4: Simplify right side
    840.30x = 563,831.03
  5. Step 5: Solve for x
    x = 563,831.03/840.30
  6. Step 6: Final answer
    x = 670.99

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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.