Home / 645,348.32-890,441.52-390,710.24

Finding the Fourth Proportional to 645,348.32, 890,441.52 and 390,710.24

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Solution

The fourth proportional to 645,348.32, 890,441.52 and 390,710.24 is: 539,095.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,348.32 : 890,441.52 = 390,710.24 : x
  2. Step 2: Convert to fraction form
    645,348.32/890,441.52 = 390,710.24/x
  3. Step 3: Cross multiply
    645,348.32x = 890,441.52 × 390,710.24
  4. Step 4: Simplify right side
    645,348.32x = 347,904,619,985.17
  5. Step 5: Solve for x
    x = 347,904,619,985.17/645,348.32
  6. Step 6: Final answer
    x = 539,095.88

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Double scale
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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.