Home / 645,114.52-890,288.40-358,639.36

Finding the Fourth Proportional to 645,114.52, 890,288.40 and 358,639.36

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Solution

The fourth proportional to 645,114.52, 890,288.40 and 358,639.36 is: 494,939.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,114.52 : 890,288.40 = 358,639.36 : x
  2. Step 2: Convert to fraction form
    645,114.52/890,288.40 = 358,639.36/x
  3. Step 3: Cross multiply
    645,114.52x = 890,288.40 × 358,639.36
  4. Step 4: Simplify right side
    645,114.52x = 319,292,461,991.42
  5. Step 5: Solve for x
    x = 319,292,461,991.42/645,114.52
  6. Step 6: Final answer
    x = 494,939.20

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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.