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Finding the Fourth Proportional to 630,432,124.40, 945,648,186.60 and 388,567,420.40

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Solution

The fourth proportional to 630,432,124.40, 945,648,186.60 and 388,567,420.40 is: 582,851,130.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,432,124.40 : 945,648,186.60 = 388,567,420.40 : x
  2. Step 2: Convert to fraction form
    630,432,124.40/945,648,186.60 = 388,567,420.40/x
  3. Step 3: Cross multiply
    630,432,124.40x = 945,648,186.60 × 388,567,420.40
  4. Step 4: Simplify right side
    630,432,124.40x = 367,448,076,473,099,840
  5. Step 5: Solve for x
    x = 367,448,076,473,099,840/630,432,124.40
  6. Step 6: Final answer
    x = 582,851,130.60

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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.