Home / 645,341.32-890,431.86-390,703.24

Finding the Fourth Proportional to 645,341.32, 890,431.86 and 390,703.24

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Solution

The fourth proportional to 645,341.32, 890,431.86 and 390,703.24 is: 539,086.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,341.32 : 890,431.86 = 390,703.24 : x
  2. Step 2: Convert to fraction form
    645,341.32/890,431.86 = 390,703.24/x
  3. Step 3: Cross multiply
    645,341.32x = 890,431.86 × 390,703.24
  4. Step 4: Simplify right side
    645,341.32x = 347,894,612,701.23
  5. Step 5: Solve for x
    x = 347,894,612,701.23/645,341.32
  6. Step 6: Final answer
    x = 539,086.22

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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.