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Finding the Fourth Proportional to 630,910.79, 870,706.59 and 358,990.15

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Solution

The fourth proportional to 630,910.79, 870,706.59 and 358,990.15 is: 495,434.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,910.79 : 870,706.59 = 358,990.15 : x
  2. Step 2: Convert to fraction form
    630,910.79/870,706.59 = 358,990.15/x
  3. Step 3: Cross multiply
    630,910.79x = 870,706.59 × 358,990.15
  4. Step 4: Simplify right side
    630,910.79x = 312,575,089,350.09
  5. Step 5: Solve for x
    x = 312,575,089,350.09/630,910.79
  6. Step 6: Final answer
    x = 495,434.69

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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.