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Finding the Fourth Proportional to 420,312.74, 630,653.94 and 220,586.33

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Solution

The fourth proportional to 420,312.74, 630,653.94 and 220,586.33 is: 330,976.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,312.74 : 630,653.94 = 220,586.33 : x
  2. Step 2: Convert to fraction form
    420,312.74/630,653.94 = 220,586.33/x
  3. Step 3: Cross multiply
    420,312.74x = 630,653.94 × 220,586.33
  4. Step 4: Simplify right side
    420,312.74x = 139,113,638,124.64
  5. Step 5: Solve for x
    x = 139,113,638,124.64/420,312.74
  6. Step 6: Final answer
    x = 330,976.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.